Uplink Transmit Power Allocation and Power Headroom Reporting by a User Equipment in a Multi-Connectivity Environment

1. A method of wireless communication by a user equipment (UE), comprising: establishing a connection with a first evolved NodeB (eNB) and a second eNB, wherein each of the first eNB and the second eNB provide radio resources to the UE for respective uplink communications; receiving from the first eNB, by the UE, an indication of a configuration of uplink transmit power for a plurality of eNBs, the configuration including a first uplink transmit power value for the first eNB and a second uplink transmit power value for the second eNB; allocating, by the UE, more uplink transmit power for one of the respective uplink communications to the first eNB or to the second eNB than provided by the corresponding first or second uplink transmit power value of the configuration of the received indication without exceeding a maximum transmit power for the UE; and transmitting the respective uplink communications from the UE to the first eNB and the second eNB.

2. The method of claim 1 , further comprising: generating a power headroom report at the UE comprising power headroom information for both the first eNB and the second eNB; and transmitting the power headroom report to at least one of the first eNB and the second eNB.

3. The method of claim 2 , wherein the power headroom information is based at least in part on scheduling information from both the first eNB and the second eNB; and wherein the first eNB and the second eNB schedule communications with the UE on different sets of resources.

4. The method of claim 2 , wherein the power headroom report is transmitted to the first eNB or the second eNB in response to a triggering message received from the first eNB or the second eNB.

5. The method of claim 4 , wherein the triggering message comprises an indication that the first eNB or the second eNB has activated an uplink cell.

6. The method of claim 2 , further comprising: triggering the power headroom report at the UE based on a measured pathloss of the second eNB.

7. The method of claim 1 , further comprising: determining, at the UE, an uplink transmit power for each of a plurality of cells controlled by the first eNB or the second eNB based at least in part on the indication.

8. The method of claim 1 , wherein allocating more uplink transmit power for one of the respective uplink communications to the first eNB or the second eNB is performed based at least in part on a priority of uplink data or control information for the one of the respective uplink communications to the first eNB or the second eNB with respect to uplink data or control information for the other of the respective communications to the first eNB or the second eNB.

9. The method of claim 1 , further comprising: allocating less uplink transmit power for the other of the respective uplink communications to the first eNB or the second eNB than provided by the corresponding first or second uplink transmit power value of the configuration of the received indication, the less uplink transmit power allocated for the other of the respective uplink communications to the first eNB or the second eNB corresponding to the more uplink transmit power allocated for the one of the respective uplink communications to the first eNB or to the second eNB.

10. The method of claim 1 , wherein allocating more uplink transmit power for one of the respective communications to the first eNB or the second eNB comprises borrowing at least one of a remaining power of the maximum transmit power for the UE or an available power associated with a difference between an actual power requirement for the other of the respective uplink communications to the first eNB or the second eNB being less than the corresponding first or second uplink transmit power value of the configuration for the other of the respective uplink communications to the first eNB or the second eNB.

11. The method of claim 1 , further comprising: determining to allocate the more uplink power based at least in part on use of an uplink for communication to the other of the respective uplink communications to the first eNB or the second eNB.

12. A device for wireless communication by a user equipment (UE), comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to: establish a connection with a first evolved NodeB (eNB) and a second eNB, wherein each of the first eNB and the second eNB provide radio resources to the UE for respective uplink communications; receive from the first eNB, at the UE, an indication of a configuration of uplink transmit power for a plurality of eNBs, the configuration including a first uplink transmit power value for the first eNB and a second uplink transmit power value for the second eNB; allocate more uplink transmit power for one of the respective uplink communications to the first eNB or the second eNB than provided by the corresponding first or second uplink transmit power value of the configuration of the received indication without exceeding a maximum transmit power for the UE; and transmit the respective uplink communications from the UE to the first eNB and the second eNB.

13. The device of claim 12 , wherein the instructions are executable by the processor to: generate a power headroom report at the UE comprising power headroom information for both the first eNB and the second eNB; and transmit the power headroom report to at least one of the first eNB and the second eNB.

14. The device of claim 13 , wherein the power headroom information is based at least in part on scheduling information from both the first eNB and the second eNB; and wherein the first eNB and the second eNB schedule communications with the UE on different sets of resources.

15. The device of claim 13 , wherein the power headroom report is transmitted to the first eNB or the second eNB in response to a triggering message received from the first eNB or the second eNB.

16. The device of claim 15 , wherein the triggering message comprises an indication that the first eNB or the second eNB has activated an uplink cell.

17. The device of claim 13 , wherein the instructions are executable by the processor to: trigger the power headroom report at the UE based on a measured pathloss of the second eNB.

18. The device of claim 12 , wherein the instructions are executable by the processor to: determine, at the UE, an uplink transmit power for each of a plurality of cells controlled by the first eNB or the second eNB based at least in part on the indication.

19. An apparatus for wireless communication, comprising: means for establishing a connection with a first evolved NodeB (eNB) and a second eNB, wherein each of the first eNB and the second eNB provide radio resources to the apparatus for respective uplink communications; means for receiving from the first eNB, by the apparatus, an indication of a configuration of uplink transmit power for a plurality of eNBs, the configuration including a first uplink transmit power value for the first eNB and a second uplink transmit power value for the second eNB; means for allocating, by the apparatus, more uplink transmit power for one of the respective uplink communications to the first eNB or to the second eNB than provided by the corresponding first or second uplink transmit power value of the configuration of the received indication without exceeding a maximum transmit power for the apparatus; and means for transmitting the respective uplink communications from the apparatus to the first eNB and the second eNB.

20. The apparatus of claim 19 , further comprising: means for generating a power headroom report at the apparatus comprising power headroom information for both the first eNB and the second eNB; and means for transmitting the power headroom report to at least one of the first eNB and the second eNB.

21. The apparatus of claim 20 , wherein the power headroom information is based at least in part on scheduling information from both the first eNB and the second eNB; and wherein the first eNB and the second eNB schedule communications with the apparatus on different sets of resources.

22. The apparatus of claim 20 , wherein the power headroom report is transmitted to the first eNB or the second eNB in response to a triggering message received from the first eNB or the second eNB.

23. The apparatus of claim 22 , wherein the triggering message comprises an indication that the first eNB or the second eNB has activated an uplink cell.

24. The apparatus of claim 20 , further comprising: means for triggering the power headroom report at the apparatus based on a measured pathloss of the second eNB.

25. The apparatus of claim 19 , further comprising: means for determining, at the apparatus, an uplink transmit power for each of a plurality of cells controlled by the first eNB or the second eNB based at least in part on the indication.

26. A non-transitory computer-readable medium storing code wireless communication by a user equipment (UE), the code comprising instructions executable by a processor to: establish a connection with a first evolved NodeB (eNB) and a second eNB, wherein each of the first eNB and the second eNB provide radio resources to the UE for respective uplink communications; receive from the first eNB, by the UE, an indication of a configuration of uplink transmit power for a plurality of eNBs, the configuration including a first uplink transmit power value for the first eNB and a second uplink transmit power value for the second eNB; allocate, by the UE, more uplink transmit power for one of the respective uplink communications to the first eNB or to the second eNB than provided by the corresponding first or second uplink transmit power value of the configuration of the received indication without exceeding a maximum transmit power for the UE; and transmit the respective uplink communications from the UE to the first eNB and the second eNB.

27. The non-transitory computer-readable medium of claim 26 , wherein the instructions are further executable to: generate a power headroom report at the UE comprising power headroom information for both the first eNB and the second eNB; and transmit the power headroom report to at least one of the first eNB and the second eNB.

28. The non-transitory computer-readable medium of claim 27 , wherein the power headroom information is based at least in part on scheduling information from both the first eNB and the second eNB; and wherein the first eNB and the second eNB schedule communications with the UE on different sets of resources.

29. The non-transitory computer-readable medium of claim 27 , wherein the power headroom report is transmitted to the first eNB or the second eNB in response to a triggering message received from the first eNB or the second eNB.

30. The non-transitory computer-readable medium of claim 26 , wherein the instructions are further executable to: determine an uplink transmit power for each of a plurality of cells controlled by the first eNB or the second eNB based at least in part on the indication.